Alexander Bui, MD
Ophthalmology Physician in Los Angeles, California. This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 22,090 in Ophthalmology Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Alexander Bui, MD filed 548 Medicare Part D claims in 2023 as a Ophthalmology Physician in Los Angeles, California, prescribing 79% generic.
- 548
- Part D claims, 2023
- 79%
- generic prescribing
- Likely
- board-certified (heuristic)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Alexander Bui, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
548 Top 34% higher than 66% of 1,370,886 prescribers
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source CMS Medicare Part D Prescriber Public Use File · 2023
Alexander Bui, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Alexander Bui, MD?
Quality data not reportedPrimary specialty
Medicare Part D claims
Specialty distribution in California
How Ophthalmology Physician compares to other specialties among California providers
Ophthalmology Physician ranks #47 among California's specialties (0.3% of in-state providers)
Each bar is a specialty's share of the California provider total, by primary NUCC taxonomy. The highlighted bar is Ophthalmology Physician; the long tail of smaller specialties is omitted for legibility.
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Ophthalmology Physician. Verify directly:
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Alexander Bui, MD appears in the CMS NPPES registry as a Ophthalmology Physician provider holding MD credentials at 6041 CADILLAC AVE, Los Angeles, CA, 90034, with a listed phone of (323) 857-2000. NPI 1578750261 was issued on 09/27/2007. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what Bui most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.
Medicare Part D records for calendar year 2023 show 548 prescription claims written by this provider, covering 157 Medicare beneficiaries and totaling roughly $14K in drug spend, split 21% brand-name and 79% generic by claim count. These figures capture only Medicare Part D, commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy.
Ophthalmology Physician is a mid-sized specialty nationwide, with 22,090 enrolled providers across 56 states and an average of 1,420 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline. Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1578750261 |
|---|---|
| Specialty | Ophthalmology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 09/27/2007 |
Verify this provider's license
PlainDoctor pulls this profile from the CMS NPPES public registry. Confirm Alexander Bui, MD's current license status, disciplinary history, and board certifications with the Medical Board of California in California before relying on this page for a clinical or care decision.
How we sourced this profile
Hospital and facility affiliations
Facilities where Alexander Bui, MD bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
License & disciplinary context - California MBC 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~150K California medical licensees in 2023 - they are NOT specific to Alexander Bui, MD. To verify Alexander Bui, MD's current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
MBC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Typical
21% brand-name claims vs 79% generic, on 548 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
Prescribing Breakdown
- 30-Day Fills
- 1,195
- Total Day Supply
- 34,365
- Brand vs Generic
- 21% brand / 79% generic
- Brand Drug Cost
- $6K
- Generic Drug Cost
- $8K
Patient Demographics
- Average Patient Age
- 76.2 years
- Avg HCC Risk Score
- 1.93
- Gender Split
- 54% female / 46% male
- Age Distribution
- <65: 11, 65-74: 51, 75-84: 70, 85+: 25
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Alexander Bui, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Latanoprost
Latanoprost
154 claims
- Prednisolone Acetate
Prednisolone Acetate
100 claims
- Dorzolamide-Timolol
Dorzolamide-Timolol
81 claims
- Brimonidine Tartrate
Brimonidine Tartrate
75 claims
- Ketorolac Trometha… 35
Ketorolac Tromethamine
35 claims
- Neomycin-Polymyxin… 22
Neomycin-Polymyxin-Dexameth
22 claims
- Ofloxacin 19
Ofloxacin
19 claims
- Timolol Maleate 15
Timolol Maleate
15 claims
| Drug | Claims |
|---|---|
| Latanoprost | 154 |
| Prednisolone Acetate | 100 |
| Dorzolamide-Timolol Dorzolamide Hcl/Timolol Maleat | 81 |
| Brimonidine Tartrate | 75 |
| Ketorolac Tromethamine | 35 |
| Neomycin-Polymyxin-Dexameth Neomycin/Polymyxin B/Dexametha | 22 |
| Ofloxacin | 19 |
| Timolol Maleate | 15 |
| Dorzolamide Hcl | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Ophthalmology Physician Overview
How Alexander Bui, MD fits within the Ophthalmology Physician landscape nationally.
Alexander Bui, MD's 548 claims are below the specialty average of 1,420.
Nearby Ophthalmology Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Bui.
Compare Ophthalmology Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the California medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Ophthalmology Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
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Data Sources
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology